DIN EN 677:1998 Gas-fired central heating boilers - Specific requirements for condensing boilers with a nominal heat input not exceeding 70 kW; German version EN 677:1998
2014DIN EN 15502-2-2:2014 Gas-fired central heating boilers - Part 2-2: Specific standard for type B1 appliances; German version EN 15502-2-2:2014
1998DIN EN 677:1998 Gas-fired central heating boilers - Specific requirements for condensing boilers with a nominal heat input not exceeding 70 kW; German version EN 677:1998
0000 DIN EN 677:1992
1990DIN 4702-6:1990 Central heating boilers; condensing boilers for gaseous fuels